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- Peer Gynt (Henrik Ibsen, 1876)
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- 1876 music by Edvard Grieg, from which he later derived two orchestral suites, Opp. 46 (1888), 55 (1891)
- 1948 music by Harald Sæverud, Op. 28
- Pelléas and Mélisande (Maurice Maeterlinck, 1893)
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- 1898 music by Gabriel Fauré, Op. 80
- 1905 music by Jean Sibelius, Op. 46
- The Persians (Aeschylus, 472 BC)
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- 1934 music by Marios Varvoglis
- 1940 music by Henri Sauguet
- Un petit ange de rien du tout (C. A. Puget)
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- 1940 music by Darius Milhaud, Op. 215
- Phaëton, or Reckless Audacity (Joost van den Vondel, 1663)
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- 1937 music by Willem Pijper
- La Pharmacienne (Jean Giraudoux)
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- 1949 music by Henri Sauguet
- Phèdre (Jean Racine, 1677)
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- 1900 music by Jules Massenet
- Philip II (Emile Verhaeren)
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- 1918 music by Eugene Goossens, Op. 22
- Philoctetes (Sophocles, c. 409 BC)
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- music by Alexander Ilyinsky (died 1920)
- Le Piège de Méduse (Erik Satie, 1913)
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- music also by Erik Satie; sometimes described as an operetta
- La Pisanella (Gabriele d'Annunzio)
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- 1913 music by Ildebrando Pizzetti
- Pizarro (Richard Brinsley Sheridan, 1799)
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- music by Jan Ladislav Dussek (with Michael Kelly)
- Plutus (Jollivet, after Aristophanes, 380 BC)
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- 1938 music by Darius Milhaud, Op. 186
- Polyeucte (Pierre Corneille, 1642)
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- 1881 music by Edgar Tinel (an orchestral suite was produced in 1906)
- The Post Office (Rabindranath Tagore, 1912)
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- music by Heinz Tiessen (died 1971)
- Preciosa (Pius Alexander Wolff, based on Miguel de Cervantes' La gitanella; 1821)
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- 1820 music by Carl Maria von Weber, Op. 78, J. 279
- Prince Potemkin (Kniaź Patiomkin; Tadeusz Miciński, 1906)
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- 1924 music by Karol Szymanowski, Op. 51
- The Princess of Cyprus (Zachris Topelius)
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- music by Fredrik Pacius (died 1891)
- Princess Dandelion (Jaroslav Kvapil)
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- 1897 music by Josef Bohuslav Foerster, Op. 35
- La Princesse lointaine (Edmond Rostand, 1895)
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- 1897 music by Gabriel Pierné
- Princess Maleine (La princesse Maleine; Maurice Maeterlinck, 1889)
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- music by Lili Boulanger (died 1918; she also worked on an opera on the same subject, which was not finished)
- music by Maximilian Steinberg (died 1946)
- Prinz Friedrich von Homburg (The Prince of Homburg; Heinrich von Kleist, 1811)
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- 1884 music by Hugo Wolf (unfinished)
- Prometheus Bound (Aeschylus, c. 415 BC)
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- 1948 music by Norman Demuth
- Prometheus Unbound (Percy Bysshe Shelley, 1820)
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- 1948 music by Norman Demuth
- music by Lars-Erik Larsson (died 1986)
- Protée (Paul Claudel)
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- 1919 music by Darius Milhaud, Op. 17 (also 1955)
- 1955 music by Darius Milhaud, Op. 341 (also 1919)
Read more about this topic: Plays With Incidental Music